/**
 * Copyright 2009 Taro L. Saito
 *
 * <p>Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of the License at
 *
 * <p>http://www.apache.org/licenses/LICENSE-2.0
 *
 * <p>Unless required by applicable law or agreed to in writing, software distributed under the
 * License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 * express or implied. See the License for the specific language governing permissions and
 * limitations under the License.
 * --------------------------------------------------------------------------
 */
// --------------------------------------
// sqlite-jdbc Project
//
// SQLiteConfig.java
// Since: Dec 8, 2009
//
// $URL$
// $Author$
// --------------------------------------
package org.sqlite;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.DriverPropertyInfo;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.HashSet;
import java.util.Properties;
import java.util.Set;
import java.util.TreeSet;

/**
 * SQLite Configuration
 *
 * <p>See also https://www.sqlite.org/pragma.html
 *
 * @author leo
 */
public class SQLiteConfig {
    /* Date storage class*/
    public static final String DEFAULT_DATE_STRING_FORMAT = "yyyy-MM-dd HH:mm:ss.SSS";
    /* Default limits used by SQLite: https://www.sqlite.org/limits.html */
    private static final int DEFAULT_MAX_LENGTH = 1000000000;
    private static final int DEFAULT_MAX_COLUMN = 2000;
    private static final int DEFAULT_MAX_SQL_LENGTH = 1000000;
    private static final int DEFAULT_MAX_FUNCTION_ARG = 100;
    private static final int DEFAULT_MAX_ATTACHED = 10;
    private static final int DEFAULT_MAX_PAGE_COUNT = 1073741823;

    private final Properties pragmaTable;
    private int openModeFlag = 0x00;

    private int busyTimeout;
    private boolean explicitReadOnly;

    private final SQLiteConnectionConfig defaultConnectionConfig;

    /** Default constructor. */
    public SQLiteConfig() {
        this(new Properties());
    }

    /**
     * Creates an SQLite configuration object using values from the given property object.
     *
     * @param prop The properties to apply to the configuration.
     */
    public SQLiteConfig(Properties prop) {
        this.pragmaTable = prop;

        String openMode = pragmaTable.getProperty(Pragma.OPEN_MODE.pragmaName);
        if (openMode != null) {
            openModeFlag = Integer.parseInt(openMode);
        } else {
            // set the default open mode of SQLite3
            setOpenMode(SQLiteOpenMode.READWRITE);
            setOpenMode(SQLiteOpenMode.CREATE);
        }
        // Shared Cache
        setSharedCache(
                Boolean.parseBoolean(
                        pragmaTable.getProperty(Pragma.SHARED_CACHE.pragmaName, "false")));
        // Enable URI filenames
        setOpenMode(SQLiteOpenMode.OPEN_URI);

        setBusyTimeout(
                Integer.parseInt(pragmaTable.getProperty(Pragma.BUSY_TIMEOUT.pragmaName, "3000")));
        this.defaultConnectionConfig = SQLiteConnectionConfig.fromPragmaTable(pragmaTable);
        this.explicitReadOnly =
                Boolean.parseBoolean(
                        pragmaTable.getProperty(Pragma.JDBC_EXPLICIT_READONLY.pragmaName, "false"));
    }

    public SQLiteConnectionConfig newConnectionConfig() {
        return defaultConnectionConfig.copyConfig();
    }

    /**
     * Create a new JDBC connection using the current configuration
     *
     * @return The connection.
     * @throws SQLException
     */
    public Connection createConnection(String url) throws SQLException {
        return JDBC.createConnection(url, toProperties());
    }

    /**
     * Configures a connection.
     *
     * @param conn The connection to configure.
     * @throws SQLException
     */
    public void apply(Connection conn) throws SQLException {

        HashSet<String> pragmaParams = new HashSet<String>();
        for (Pragma each : Pragma.values()) {
            pragmaParams.add(each.pragmaName);
        }

        if (conn instanceof SQLiteConnection) {
            SQLiteConnection sqliteConn = (SQLiteConnection) conn;
            sqliteConn.setLimit(
                    SQLiteLimits.SQLITE_LIMIT_ATTACHED,
                    parseLimitPragma(Pragma.LIMIT_ATTACHED, DEFAULT_MAX_ATTACHED));
            sqliteConn.setLimit(
                    SQLiteLimits.SQLITE_LIMIT_COLUMN,
                    parseLimitPragma(Pragma.LIMIT_COLUMN, DEFAULT_MAX_COLUMN));
            sqliteConn.setLimit(
                    SQLiteLimits.SQLITE_LIMIT_COMPOUND_SELECT,
                    parseLimitPragma(Pragma.LIMIT_COMPOUND_SELECT, -1));
            sqliteConn.setLimit(
                    SQLiteLimits.SQLITE_LIMIT_EXPR_DEPTH,
                    parseLimitPragma(Pragma.LIMIT_EXPR_DEPTH, -1));
            sqliteConn.setLimit(
                    SQLiteLimits.SQLITE_LIMIT_FUNCTION_ARG,
                    parseLimitPragma(Pragma.LIMIT_FUNCTION_ARG, DEFAULT_MAX_FUNCTION_ARG));
            sqliteConn.setLimit(
                    SQLiteLimits.SQLITE_LIMIT_LENGTH,
                    parseLimitPragma(Pragma.LIMIT_LENGTH, DEFAULT_MAX_LENGTH));
            sqliteConn.setLimit(
                    SQLiteLimits.SQLITE_LIMIT_LIKE_PATTERN_LENGTH,
                    parseLimitPragma(Pragma.LIMIT_LIKE_PATTERN_LENGTH, -1));
            sqliteConn.setLimit(
                    SQLiteLimits.SQLITE_LIMIT_SQL_LENGTH,
                    parseLimitPragma(Pragma.LIMIT_SQL_LENGTH, DEFAULT_MAX_SQL_LENGTH));
            sqliteConn.setLimit(
                    SQLiteLimits.SQLITE_LIMIT_TRIGGER_DEPTH,
                    parseLimitPragma(Pragma.LIMIT_TRIGGER_DEPTH, -1));
            sqliteConn.setLimit(
                    SQLiteLimits.SQLITE_LIMIT_VARIABLE_NUMBER,
                    parseLimitPragma(Pragma.LIMIT_VARIABLE_NUMBER, -1));
            sqliteConn.setLimit(
                    SQLiteLimits.SQLITE_LIMIT_VDBE_OP, parseLimitPragma(Pragma.LIMIT_VDBE_OP, -1));
            sqliteConn.setLimit(
                    SQLiteLimits.SQLITE_LIMIT_WORKER_THREADS,
                    parseLimitPragma(Pragma.LIMIT_WORKER_THREADS, -1));
            sqliteConn.setLimit(
                    SQLiteLimits.SQLITE_LIMIT_PAGE_COUNT,
                    parseLimitPragma(Pragma.LIMIT_PAGE_COUNT, DEFAULT_MAX_PAGE_COUNT));
        }

        pragmaParams.remove(Pragma.OPEN_MODE.pragmaName);
        pragmaParams.remove(Pragma.SHARED_CACHE.pragmaName);
        pragmaParams.remove(Pragma.LOAD_EXTENSION.pragmaName);
        pragmaParams.remove(Pragma.DATE_PRECISION.pragmaName);
        pragmaParams.remove(Pragma.DATE_CLASS.pragmaName);
        pragmaParams.remove(Pragma.DATE_STRING_FORMAT.pragmaName);
        pragmaParams.remove(Pragma.PASSWORD.pragmaName);
        pragmaParams.remove(Pragma.HEXKEY_MODE.pragmaName);
        pragmaParams.remove(Pragma.LIMIT_ATTACHED.pragmaName);
        pragmaParams.remove(Pragma.LIMIT_COLUMN.pragmaName);
        pragmaParams.remove(Pragma.LIMIT_COMPOUND_SELECT.pragmaName);
        pragmaParams.remove(Pragma.LIMIT_EXPR_DEPTH.pragmaName);
        pragmaParams.remove(Pragma.LIMIT_FUNCTION_ARG.pragmaName);
        pragmaParams.remove(Pragma.LIMIT_LENGTH.pragmaName);
        pragmaParams.remove(Pragma.LIMIT_LIKE_PATTERN_LENGTH.pragmaName);
        pragmaParams.remove(Pragma.LIMIT_SQL_LENGTH.pragmaName);
        pragmaParams.remove(Pragma.LIMIT_TRIGGER_DEPTH.pragmaName);
        pragmaParams.remove(Pragma.LIMIT_VARIABLE_NUMBER.pragmaName);
        pragmaParams.remove(Pragma.LIMIT_VDBE_OP.pragmaName);
        pragmaParams.remove(Pragma.LIMIT_WORKER_THREADS.pragmaName);
        pragmaParams.remove(Pragma.LIMIT_PAGE_COUNT.pragmaName);

        // exclude this "fake" pragma from execution
        pragmaParams.remove(Pragma.JDBC_EXPLICIT_READONLY.pragmaName);
        pragmaParams.remove(Pragma.JDBC_GET_GENERATED_KEYS.pragmaName);

        Statement stat = conn.createStatement();
        try {
            if (pragmaTable.containsKey(Pragma.PASSWORD.pragmaName)) {
                String password = pragmaTable.getProperty(Pragma.PASSWORD.pragmaName);
                if (password != null && !password.isEmpty()) {
                    String hexkeyMode = pragmaTable.getProperty(Pragma.HEXKEY_MODE.pragmaName);
                    String passwordPragma;
                    if (HexKeyMode.SSE.name().equalsIgnoreCase(hexkeyMode)) {
                        passwordPragma = "pragma hexkey = '%s'";
                    } else if (HexKeyMode.SQLCIPHER.name().equalsIgnoreCase(hexkeyMode)) {
                        passwordPragma = "pragma key = \"x'%s'\"";
                    } else {
                        passwordPragma = "pragma key = '%s'";
                    }
                    stat.execute(String.format(passwordPragma, password.replace("'", "''")));
                    stat.execute("select 1 from sqlite_schema");
                }
            }

            for (Object each : pragmaTable.keySet()) {
                String key = each.toString();
                if (!pragmaParams.contains(key)) {
                    continue;
                }

                String value = pragmaTable.getProperty(key);
                if (value != null) {
                    stat.execute(String.format("pragma %s=%s", key, value));
                }
            }
        } finally {
            if (stat != null) {
                stat.close();
            }
        }
    }

    /**
     * Sets a pragma to the given boolean value.
     *
     * @param pragma The pragma to set.
     * @param flag The boolean value.
     */
    private void set(Pragma pragma, boolean flag) {
        setPragma(pragma, Boolean.toString(flag));
    }

    /**
     * Sets a pragma to the given int value.
     *
     * @param pragma The pragma to set.
     * @param num The int value.
     */
    private void set(Pragma pragma, int num) {
        setPragma(pragma, Integer.toString(num));
    }

    /**
     * Checks if the provided value is the default for a given pragma.
     *
     * @param pragma The pragma on which to check.
     * @param defaultValue The value to check for.
     * @return True if the given value is the default value; false otherwise.
     */
    private boolean getBoolean(Pragma pragma, String defaultValue) {
        return Boolean.parseBoolean(pragmaTable.getProperty(pragma.pragmaName, defaultValue));
    }

    /**
     * Retrieves a pragma integer value.
     *
     * @param pragma The pragma.
     * @param defaultValue The default value.
     * @return The value of the pragma or defaultValue.
     */
    private int parseLimitPragma(Pragma pragma, int defaultValue) {
        if (!pragmaTable.containsKey(pragma.pragmaName)) {
            return defaultValue;
        }
        String valueString = pragmaTable.getProperty(pragma.pragmaName);
        try {
            return Integer.parseInt(valueString);
        } catch (NumberFormatException ex) {
            return defaultValue;
        }
    }

    /**
     * Checks if the shared cache option is turned on.
     *
     * @return True if turned on; false otherwise.
     */
    public boolean isEnabledSharedCache() {
        return getBoolean(Pragma.SHARED_CACHE, "false");
    }

    /**
     * Checks if the load extension option is turned on.
     *
     * @return True if turned on; false otherwise.
     */
    public boolean isEnabledLoadExtension() {
        return getBoolean(Pragma.LOAD_EXTENSION, "false");
    }

    /** @return The open mode flags. */
    public int getOpenModeFlags() {
        return openModeFlag;
    }

    /**
     * Sets a pragma's value.
     *
     * @param pragma The pragma to change.
     * @param value The value to set it to.
     */
    public void setPragma(Pragma pragma, String value) {
        pragmaTable.put(pragma.pragmaName, value);
    }

    /**
     * Convert this configuration into a Properties object, which can be passed to the {@link
     * DriverManager#getConnection(String, Properties)}.
     *
     * @return The property object.
     */
    public Properties toProperties() {
        pragmaTable.setProperty(Pragma.OPEN_MODE.pragmaName, Integer.toString(openModeFlag));
        pragmaTable.setProperty(
                Pragma.TRANSACTION_MODE.pragmaName,
                defaultConnectionConfig.getTransactionMode().getValue());
        pragmaTable.setProperty(
                Pragma.DATE_CLASS.pragmaName, defaultConnectionConfig.getDateClass().getValue());
        pragmaTable.setProperty(
                Pragma.DATE_PRECISION.pragmaName,
                defaultConnectionConfig.getDatePrecision().getValue());
        pragmaTable.setProperty(
                Pragma.DATE_STRING_FORMAT.pragmaName,
                defaultConnectionConfig.getDateStringFormat());
        pragmaTable.setProperty(
                Pragma.JDBC_EXPLICIT_READONLY.pragmaName, this.explicitReadOnly ? "true" : "false");
        pragmaTable.setProperty(
                Pragma.JDBC_GET_GENERATED_KEYS.pragmaName,
                defaultConnectionConfig.isGetGeneratedKeys() ? "true" : "false");
        return pragmaTable;
    }

    /** @return Array of DriverPropertyInfo objects. */
    static DriverPropertyInfo[] getDriverPropertyInfo() {
        Pragma[] pragma = Pragma.values();
        DriverPropertyInfo[] result = new DriverPropertyInfo[pragma.length];
        int index = 0;
        for (Pragma p : Pragma.values()) {
            DriverPropertyInfo di = new DriverPropertyInfo(p.pragmaName, null);
            di.choices = p.choices;
            di.description = p.description;
            di.required = false;
            result[index++] = di;
        }

        return result;
    }

    static class OnOff {
        private static final String[] Values = new String[] {"true", "false"};
    }

    static final Set<String> pragmaSet = new TreeSet<String>();

    static {
        for (SQLiteConfig.Pragma pragma : SQLiteConfig.Pragma.values()) {
            pragmaSet.add(pragma.pragmaName);
        }
    }

    /** @return true if explicit read only transactions are enabled */
    public boolean isExplicitReadOnly() {
        return this.explicitReadOnly;
    }

    /**
     * Enable read only transactions after connection creation if explicit read only is true.
     *
     * @param readOnly whether to enable explicit read only
     */
    public void setExplicitReadOnly(boolean readOnly) {
        this.explicitReadOnly = readOnly;
    }

    public enum Pragma {

        // Parameters requiring SQLite3 API invocation
        OPEN_MODE("open_mode", "Database open-mode flag", null),
        SHARED_CACHE(
                "shared_cache",
                "Enable SQLite Shared-Cache mode, native driver only",
                OnOff.Values),
        LOAD_EXTENSION(
                "enable_load_extension",
                "Enable SQLite load_extension() function, native driver only",
                OnOff.Values),

        // Pragmas that can be set after opening the database
        CACHE_SIZE(
                "cache_size",
                "Maximum number of database disk pages that SQLite will hold in memory at once per open database file",
                null),
        MMAP_SIZE(
                "mmap_size",
                "Maximum number of bytes that are set aside for memory-mapped I/O on a single database",
                null),
        CASE_SENSITIVE_LIKE(
                "case_sensitive_like",
                "Installs a new application-defined LIKE function that is either case sensitive or insensitive depending on the value",
                OnOff.Values),
        COUNT_CHANGES("count_changes", "Deprecated", OnOff.Values),
        DEFAULT_CACHE_SIZE("default_cache_size", "Deprecated", null),
        DEFER_FOREIGN_KEYS(
                "defer_foreign_keys",
                "When the defer_foreign_keys PRAGMA is on, enforcement of all foreign key constraints is delayed until the outermost transaction is committed. The defer_foreign_keys pragma defaults to OFF so that foreign key constraints are only deferred if they are created as \"DEFERRABLE INITIALLY DEFERRED\". The defer_foreign_keys pragma is automatically switched off at each COMMIT or ROLLBACK. Hence, the defer_foreign_keys pragma must be separately enabled for each transaction. This pragma is only meaningful if foreign key constraints are enabled, of course.",
                OnOff.Values),
        EMPTY_RESULT_CALLBACKS("empty_result_callback", "Deprecated", OnOff.Values),
        ENCODING(
                "encoding",
                "Set the encoding that the main database will be created with if it is created by this session",
                toStringArray(Encoding.values())),
        FOREIGN_KEYS(
                "foreign_keys", "Set the enforcement of foreign key constraints", OnOff.Values),
        FULL_COLUMN_NAMES("full_column_names", "Deprecated", OnOff.Values),
        FULL_SYNC(
                "fullsync",
                "Whether or not the F_FULLFSYNC syncing method is used on systems that support it. Only Mac OS X supports F_FULLFSYNC.",
                OnOff.Values),
        INCREMENTAL_VACUUM(
                "incremental_vacuum",
                "Causes up to N pages to be removed from the freelist. The database file is truncated by the same amount. The incremental_vacuum pragma has no effect if the database is not in auto_vacuum=incremental mode or if there are no pages on the freelist. If there are fewer than N pages on the freelist, or if N is less than 1, or if the \"(N)\" argument is omitted, then the entire freelist is cleared.",
                null),
        JOURNAL_MODE(
                "journal_mode",
                "Set the journal mode for databases associated with the current database connection",
                toStringArray(JournalMode.values())),
        JOURNAL_SIZE_LIMIT(
                "journal_size_limit",
                "Limit the size of rollback-journal and WAL files left in the file-system after transactions or checkpoints",
                null),
        LEGACY_ALTER_TABLE("legacy_alter_table", "Use legacy alter table behavior", OnOff.Values),
        LEGACY_FILE_FORMAT("legacy_file_format", "No-op", OnOff.Values),
        LOCKING_MODE(
                "locking_mode",
                "Set the database connection locking-mode",
                toStringArray(LockingMode.values())),
        PAGE_SIZE(
                "page_size",
                "Set the page size of the database. The page size must be a power of two between 512 and 65536 inclusive.",
                null),
        MAX_PAGE_COUNT(
                "max_page_count", "Set the maximum number of pages in the database file", null),
        READ_UNCOMMITTED("read_uncommitted", "Set READ UNCOMMITTED isolation", OnOff.Values),
        RECURSIVE_TRIGGERS(
                "recursive_triggers", "Set the recursive trigger capability", OnOff.Values),
        REVERSE_UNORDERED_SELECTS(
                "reverse_unordered_selects",
                "When enabled, this PRAGMA causes many SELECT statements without an ORDER BY clause to emit their results in the reverse order from what they normally would",
                OnOff.Values),
        SECURE_DELETE(
                "secure_delete",
                "When secure_delete is on, SQLite overwrites deleted content with zeros",
                new String[] {"true", "false", "fast"}),
        SHORT_COLUMN_NAMES("short_column_names", "Deprecated", OnOff.Values),
        SYNCHRONOUS(
                "synchronous",
                "Set the \"synchronous\" flag",
                toStringArray(SynchronousMode.values())),
        TEMP_STORE(
                "temp_store",
                "When temp_store is DEFAULT (0), the compile-time C preprocessor macro SQLITE_TEMP_STORE is used to determine where temporary tables and indices are stored. When temp_store is MEMORY (2) temporary tables and indices are kept as if they were in pure in-memory databases. When temp_store is FILE (1) temporary tables and indices are stored in a file. The temp_store_directory pragma can be used to specify the directory containing temporary files when FILE is specified. When the temp_store setting is changed, all existing temporary tables, indices, triggers, and views are immediately deleted.",
                toStringArray(TempStore.values())),
        TEMP_STORE_DIRECTORY("temp_store_directory", "Deprecated", null),
        USER_VERSION(
                "user_version",
                "Set the value of the user-version integer at offset 60 in the database header. The user-version is an integer that is available to applications to use however they want. SQLite makes no use of the user-version itself.",
                null),
        APPLICATION_ID(
                "application_id",
                "Set the 32-bit signed big-endian \"Application ID\" integer located at offset 68 into the database header. Applications that use SQLite as their application file-format should set the Application ID integer to a unique integer so that utilities such as file(1) can determine the specific file type rather than just reporting \"SQLite3 Database\"",
                null),

        // Limits
        LIMIT_LENGTH(
                "limit_length",
                "The maximum size of any string or BLOB or table row, in bytes.",
                null),
        LIMIT_SQL_LENGTH(
                "limit_sql_length", "The maximum length of an SQL statement, in bytes.", null),
        LIMIT_COLUMN(
                "limit_column",
                "The maximum number of columns in a table definition or in the result set of a SELECT or the maximum number of columns in an index or in an ORDER BY or GROUP BY clause.",
                null),
        LIMIT_EXPR_DEPTH(
                "limit_expr_depth", "The maximum depth of the parse tree on any expression.", null),
        LIMIT_COMPOUND_SELECT(
                "limit_compound_select",
                "The maximum number of terms in a compound SELECT statement.",
                null),
        LIMIT_VDBE_OP(
                "limit_vdbe_op",
                "The maximum number of instructions in a virtual machine program used to implement an SQL statement. If sqlite3_prepare_v2() or the equivalent tries to allocate space for more than this many opcodes in a single prepared statement, an SQLITE_NOMEM error is returned.",
                null),
        LIMIT_FUNCTION_ARG(
                "limit_function_arg", "The maximum number of arguments on a function.", null),
        LIMIT_ATTACHED("limit_attached", "The maximum number of attached databases.", null),
        LIMIT_LIKE_PATTERN_LENGTH(
                "limit_like_pattern_length",
                "The maximum length of the pattern argument to the LIKE or GLOB operators.",
                null),
        LIMIT_VARIABLE_NUMBER(
                "limit_variable_number",
                "The maximum index number of any parameter in an SQL statement.",
                null),
        LIMIT_TRIGGER_DEPTH(
                "limit_trigger_depth", "The maximum depth of recursion for triggers.", null),
        LIMIT_WORKER_THREADS(
                "limit_worker_threads",
                "The maximum number of auxiliary worker threads that a single prepared statement may start.",
                null),
        LIMIT_PAGE_COUNT(
                "limit_page_count",
                "The maximum number of pages allowed in a single database file.",
                null),

        // Others
        TRANSACTION_MODE(
                "transaction_mode",
                "Set the transaction mode",
                toStringArray(TransactionMode.values())),
        DATE_PRECISION(
                "date_precision",
                "\"seconds\": Read and store integer dates as seconds from the Unix Epoch (SQLite standard).\n\"milliseconds\": (DEFAULT) Read and store integer dates as milliseconds from the Unix Epoch (Java standard).",
                toStringArray(DatePrecision.values())),
        DATE_CLASS(
                "date_class",
                "\"integer\": (Default) store dates as number of seconds or milliseconds from the Unix Epoch\n\"text\": store dates as a string of text\n\"real\": store dates as Julian Dates",
                toStringArray(DateClass.values())),
        DATE_STRING_FORMAT(
                "date_string_format",
                "Format to store and retrieve dates stored as text. Defaults to \"yyyy-MM-dd HH:mm:ss.SSS\"",
                null),
        BUSY_TIMEOUT(
                "busy_timeout",
                "Sets a busy handler that sleeps for a specified amount of time when a table is locked",
                null),
        HEXKEY_MODE("hexkey_mode", "Mode of the secret key", toStringArray(HexKeyMode.values())),
        PASSWORD("password", "Database password", null),

        // extensions: "fake" pragmas to allow conformance with JDBC
        JDBC_EXPLICIT_READONLY(
                "jdbc.explicit_readonly", "Set explicit read only transactions", null),
        JDBC_GET_GENERATED_KEYS(
                "jdbc.get_generated_keys", "Enable retrieval of generated keys", OnOff.Values);

        public final String pragmaName;
        public final String[] choices;
        public final String description;

        Pragma(String pragmaName) {
            this(pragmaName, null);
        }

        Pragma(String pragmaName, String[] choices) {
            this(pragmaName, null, choices);
        }

        Pragma(String pragmaName, String description, String[] choices) {
            this.pragmaName = pragmaName;
            this.description = description;
            this.choices = choices;
        }

        /**
         * Convert the given enum values to a string array
         *
         * @param list Array if PragmaValue.
         * @return String array of Enum values
         */
        private static String[] toStringArray(PragmaValue[] list) {
            String[] result = new String[list.length];
            for (int i = 0; i < list.length; i++) {
                result[i] = list[i].getValue();
            }
            return result;
        }

        public final String getPragmaName() {
            return pragmaName;
        }
    }

    /**
     * Sets the open mode flags.
     *
     * @param mode The open mode.
     * @see <a
     *     href="https://www.sqlite.org/c3ref/c_open_autoproxy.html">https://www.sqlite.org/c3ref/c_open_autoproxy.html</a>
     */
    public void setOpenMode(SQLiteOpenMode mode) {
        openModeFlag |= mode.flag;
    }

    /**
     * Re-sets the open mode flags.
     *
     * @param mode The open mode.
     * @see <a
     *     href="https://www.sqlite.org/c3ref/c_open_autoproxy.html">https://www.sqlite.org/c3ref/c_open_autoproxy.html</a>
     */
    public void resetOpenMode(SQLiteOpenMode mode) {
        openModeFlag &= ~mode.flag;
    }

    /**
     * Enables or disables the sharing of the database cache and schema data structures between
     * connections to the same database.
     *
     * @param enable True to enable; false to disable.
     * @see <a
     *     href="https://www.sqlite.org/c3ref/enable_shared_cache.html">www.sqlite.org/c3ref/enable_shared_cache.html</a>
     */
    public void setSharedCache(boolean enable) {
        set(Pragma.SHARED_CACHE, enable);
    }

    /**
     * Enables or disables extension loading.
     *
     * @param enable True to enable; false to disable.
     * @see <a
     *     href="https://www.sqlite.org/c3ref/load_extension.html">www.sqlite.org/c3ref/load_extension.html</a>
     */
    public void enableLoadExtension(boolean enable) {
        set(Pragma.LOAD_EXTENSION, enable);
    }

    /**
     * Sets the read-write mode for the database.
     *
     * @param readOnly True for read-only; otherwise read-write.
     */
    public void setReadOnly(boolean readOnly) {
        if (readOnly) {
            setOpenMode(SQLiteOpenMode.READONLY);
            resetOpenMode(SQLiteOpenMode.CREATE);
            resetOpenMode(SQLiteOpenMode.READWRITE);
        } else {
            setOpenMode(SQLiteOpenMode.READWRITE);
            setOpenMode(SQLiteOpenMode.CREATE);
            resetOpenMode(SQLiteOpenMode.READONLY);
        }
    }

    /**
     * Changes the maximum number of database disk pages that SQLite will hold in memory at once per
     * open database file.
     *
     * @param numberOfPages Cache size in number of pages.
     * @see <a
     *     href="https://www.sqlite.org/pragma.html#pragma_cache_size">www.sqlite.org/pragma.html#pragma_cache_size</a>
     */
    public void setCacheSize(int numberOfPages) {
        set(Pragma.CACHE_SIZE, numberOfPages);
    }

    /**
     * Enables or disables case sensitive for the LIKE operator.
     *
     * @param enable True to enable; false to disable.
     * @see <a
     *     href="https://www.sqlite.org/pragma.html#pragma_case_sensitive_like">www.sqlite.org/pragma.html#pragma_case_sensitive_like</a>
     */
    public void enableCaseSensitiveLike(boolean enable) {
        set(Pragma.CASE_SENSITIVE_LIKE, enable);
    }

    /**
     * @deprecated Enables or disables the count-changes flag. When enabled, INSERT, UPDATE and
     *     DELETE statements return the number of rows they modified.
     * @param enable True to enable; false to disable.
     * @see <a
     *     href="https://www.sqlite.org/pragma.html#pragma_count_changes">www.sqlite.org/pragma.html#pragma_count_changes</a>
     */
    @Deprecated
    public void enableCountChanges(boolean enable) {
        set(Pragma.COUNT_CHANGES, enable);
    }

    /**
     * Sets the suggested maximum number of database disk pages that SQLite will hold in memory at
     * once per open database file. The cache size set here persists across database connections.
     *
     * @param numberOfPages Cache size in number of pages.
     * @see <a
     *     href="https://www.sqlite.org/pragma.html#pragma_cache_size">www.sqlite.org/pragma.html#pragma_cache_size</a>
     */
    public void setDefaultCacheSize(int numberOfPages) {
        set(Pragma.DEFAULT_CACHE_SIZE, numberOfPages);
    }

    /**
     * Defers enforcement of foreign key constraints until the outermost transaction is committed.
     *
     * @param enable True to enable; false to disable;
     * @see <a
     *     href="https://www.sqlite.org/pragma.html#pragma_defer_foreign_keys">https://www.sqlite.org/pragma.html#pragma_defer_foreign_keys</a>
     */
    public void deferForeignKeys(boolean enable) {
        set(Pragma.DEFER_FOREIGN_KEYS, enable);
    }

    /**
     * @deprecated Enables or disables the empty_result_callbacks flag.
     * @param enable True to enable; false to disable. false.
     * @see <a
     *     href="https://www.sqlite.org/pragma.html#pragma_empty_result_callbacks">https://www.sqlite.org/pragma.html#pragma_empty_result_callbacks</a>
     */
    @Deprecated
    public void enableEmptyResultCallBacks(boolean enable) {
        set(Pragma.EMPTY_RESULT_CALLBACKS, enable);
    }

    /**
     * The common interface for retrieving the available pragma parameter values.
     *
     * @author leo
     */
    private static interface PragmaValue {
        public String getValue();
    }

    public enum Encoding implements PragmaValue {
        UTF8("'UTF-8'"),
        UTF16("'UTF-16'"),
        UTF16_LITTLE_ENDIAN("'UTF-16le'"),
        UTF16_BIG_ENDIAN("'UTF-16be'"),
        UTF_8(UTF8), // UTF-8
        UTF_16(UTF16), // UTF-16
        UTF_16LE(UTF16_LITTLE_ENDIAN), // UTF-16le
        UTF_16BE(UTF16_BIG_ENDIAN); // UTF-16be

        public final String typeName;

        Encoding(String typeName) {
            this.typeName = typeName;
        }

        Encoding(Encoding encoding) {
            this.typeName = encoding.getValue();
        }

        public String getValue() {
            return typeName;
        }

        public static Encoding getEncoding(String value) {
            return valueOf(value.replaceAll("-", "_").toUpperCase());
        }
    }

    public enum JournalMode implements PragmaValue {
        DELETE,
        TRUNCATE,
        PERSIST,
        MEMORY,
        WAL,
        OFF;

        public String getValue() {
            return name();
        }
    }

    /**
     * Sets the text encoding used by the main database.
     *
     * @param encoding One of {@link Encoding}
     * @see <a
     *     href="https://www.sqlite.org/pragma.html#pragma_encoding">www.sqlite.org/pragma.html#pragma_encoding</a>
     */
    public void setEncoding(Encoding encoding) {
        setPragma(Pragma.ENCODING, encoding.typeName);
    }

    /**
     * Whether to enforce foreign key constraints. This setting affects the execution of all
     * statements prepared using the database connection, including those prepared before the
     * setting was changed.
     *
     * @param enforce True to enable; false to disable.
     * @see <a
     *     href="https://www.sqlite.org/pragma.html#pragma_foreign_keys">www.sqlite.org/pragma.html#pragma_foreign_keys</a>
     */
    public void enforceForeignKeys(boolean enforce) {
        set(Pragma.FOREIGN_KEYS, enforce);
    }

    /**
     * @deprecated Enables or disables the full_column_name flag. This flag together with the
     *     short_column_names flag determine the way SQLite assigns names to result columns of
     *     SELECT statements.
     * @param enable True to enable; false to disable.
     * @see <a
     *     href="https://www.sqlite.org/pragma.html#pragma_full_column_names">www.sqlite.org/pragma.html#pragma_full_column_names</a>
     */
    @Deprecated
    public void enableFullColumnNames(boolean enable) {
        set(Pragma.FULL_COLUMN_NAMES, enable);
    }

    /**
     * Enables or disables the fullfsync flag. This flag determines whether or not the F_FULLFSYNC
     * syncing method is used on systems that support it. The default value of the fullfsync flag is
     * off. Only Mac OS X supports F_FULLFSYNC.
     *
     * @param enable True to enable; false to disable.
     * @see <a
     *     href="https://www.sqlite.org/pragma.html#pragma_fullfsync">www.sqlite.org/pragma.html#pragma_fullfsync</a>
     */
    public void enableFullSync(boolean enable) {
        set(Pragma.FULL_SYNC, enable);
    }

    /**
     * Sets the incremental_vacuum value; the number of pages to be removed from the <a
     * href="https://www.sqlite.org/fileformat2.html#freelist">freelist</a>. The database file is
     * truncated by the same amount.
     *
     * @param numberOfPagesToBeRemoved The number of pages to be removed.
     * @see <a
     *     href="https://www.sqlite.org/pragma.html#pragma_incremental_vacuum">www.sqlite.org/pragma.html#pragma_incremental_vacuum</a>
     */
    public void incrementalVacuum(int numberOfPagesToBeRemoved) {
        set(Pragma.INCREMENTAL_VACUUM, numberOfPagesToBeRemoved);
    }

    /**
     * Sets the journal mode for databases associated with the current database connection.
     *
     * @param mode One of {@link JournalMode}
     * @see <a
     *     href="https://www.sqlite.org/pragma.html#pragma_journal_mode">www.sqlite.org/pragma.html#pragma_journal_mode</a>
     */
    public void setJournalMode(JournalMode mode) {
        setPragma(Pragma.JOURNAL_MODE, mode.name());
    }

    /**
     * Sets the journal_size_limit. This setting limits the size of the rollback-journal and WAL
     * files left in the file-system after transactions or checkpoints.
     *
     * @param limit Limit value in bytes. A negative number implies no limit.
     * @see <a
     *     href="https://www.sqlite.org/pragma.html#pragma_journal_size_limit">www.sqlite.org/pragma.html#pragma_journal_size_limit</a>
     */
    public void setJournalSizeLimit(int limit) {
        set(Pragma.JOURNAL_SIZE_LIMIT, limit);
    }

    /**
     * Sets the value of the legacy_file_format flag. When this flag is enabled, new SQLite
     * databases are created in a file format that is readable and writable by all versions of
     * SQLite going back to 3.0.0. When the flag is off, new databases are created using the latest
     * file format which might not be readable or writable by versions of SQLite prior to 3.3.0.
     *
     * @param use True to turn on legacy file format; false to turn off.
     * @see <a
     *     href="https://www.sqlite.org/pragma.html#pragma_legacy_file_format">www.sqlite.org/pragma.html#pragma_legacy_file_format</a>
     */
    public void useLegacyFileFormat(boolean use) {
        set(Pragma.LEGACY_FILE_FORMAT, use);
    }

    /**
     * Sets the value of the legacy_alter_table flag. When this flag is on, the ALTER TABLE RENAME
     * command (for changing the name of a table) works as it did in SQLite 3.24.0 (2018-06-04) and
     * earlier.When the flag is off, using the ALTER TABLE RENAME command will mean that all
     * references to the table anywhere in the schema will be converted to the new name.
     *
     * @param flag True to turn on legacy alter table behaviour; false to turn off.
     * @see <a href="https://www.sqlite.org/pragma.html#pragma_legacy_alter_table</a>
     */
    public void setLegacyAlterTable(boolean flag) {
        set(Pragma.LEGACY_ALTER_TABLE, flag);
    }

    public enum LockingMode implements PragmaValue {
        NORMAL,
        EXCLUSIVE;

        public String getValue() {
            return name();
        }
    }

    /**
     * Sets the database connection locking-mode.
     *
     * @param mode One of {@link LockingMode}
     * @see <a
     *     href="https://www.sqlite.org/pragma.html#pragma_locking_mode">www.sqlite.org/pragma.html#pragma_locking_mode</a>
     */
    public void setLockingMode(LockingMode mode) {
        setPragma(Pragma.LOCKING_MODE, mode.name());
    }

    /**
     * Sets the page size of the database. The page size must be a power of two between 512 and
     * 65536 inclusive.
     *
     * @param numBytes A power of two between 512 and 65536 inclusive.
     * @see <a
     *     href="https://www.sqlite.org/pragma.html#pragma_page_size">www.sqlite.org/pragma.html#pragma_page_size</a>
     */
    public void setPageSize(int numBytes) {
        set(Pragma.PAGE_SIZE, numBytes);
    }

    /**
     * Sets the maximum number of pages in the database file.
     *
     * @param numPages Number of pages.
     * @see <a
     *     href="https://www.sqlite.org/pragma.html#pragma_max_page_count">www.sqlite.org/pragma.html#pragma_max_page_count</a>
     */
    public void setMaxPageCount(int numPages) {
        set(Pragma.MAX_PAGE_COUNT, numPages);
    }

    /**
     * Enables or disables useReadUncommittedIsolationMode.
     *
     * @param useReadUncommittedIsolationMode True to turn on; false to disable. disabled otherwise.
     * @see <a
     *     href="https://www.sqlite.org/pragma.html#pragma_read_uncommitted">www.sqlite.org/pragma.html#pragma_read_uncommitted</a>
     */
    public void setReadUncommitted(boolean useReadUncommittedIsolationMode) {
        set(Pragma.READ_UNCOMMITTED, useReadUncommittedIsolationMode);
    }

    /**
     * Enables or disables the recursive trigger capability.
     *
     * @param enable True to enable the recursive trigger capability.
     * @see <a
     *     href="www.sqlite.org/pragma.html#pragma_recursive_triggers">www.sqlite.org/pragma.html#pragma_recursive_triggers</a>
     */
    public void enableRecursiveTriggers(boolean enable) {
        set(Pragma.RECURSIVE_TRIGGERS, enable);
    }

    /**
     * Enables or disables the reverse_unordered_selects flag. This setting causes SELECT statements
     * without an ORDER BY clause to emit their results in the reverse order of what they normally
     * would. This can help debug applications that are making invalid assumptions about the result
     * order.
     *
     * @param enable True to enable reverse_unordered_selects.
     * @see <a
     *     href="https://www.sqlite.org/pragma.html#pragma_reverse_unordered_selects">www.sqlite.org/pragma.html#pragma_reverse_unordered_selects</a>
     */
    public void enableReverseUnorderedSelects(boolean enable) {
        set(Pragma.REVERSE_UNORDERED_SELECTS, enable);
    }

    /**
     * Enables or disables the short_column_names flag. This flag affects the way SQLite names
     * columns of data returned by SELECT statements.
     *
     * @param enable True to enable short_column_names.
     * @see <a
     *     href="https://www.sqlite.org/pragma.html#pragma_short_column_names">www.sqlite.org/pragma.html#pragma_short_column_names</a>
     */
    public void enableShortColumnNames(boolean enable) {
        set(Pragma.SHORT_COLUMN_NAMES, enable);
    }

    public enum SynchronousMode implements PragmaValue {
        OFF,
        NORMAL,
        FULL;

        public String getValue() {
            return name();
        }
    }

    /**
     * Changes the setting of the "synchronous" flag.
     *
     * @param mode One of {@link SynchronousMode}:
     *     <ul>
     *       <li>OFF - SQLite continues without syncing as soon as it has handed data off to the
     *           operating system
     *       <li>NORMAL - the SQLite database engine will still sync at the most critical moments,
     *           but less often than in FULL mode
     *       <li>FULL - the SQLite database engine will use the xSync method of the VFS to ensure
     *           that all content is safely written to the disk surface prior to continuing. This
     *           ensures that an operating system crash or power failure will not corrupt the
     *           database.
     *     </ul>
     *
     * @see <a
     *     href="https://www.sqlite.org/pragma.html#pragma_synchronous">www.sqlite.org/pragma.html#pragma_synchronous</a>
     */
    public void setSynchronous(SynchronousMode mode) {
        setPragma(Pragma.SYNCHRONOUS, mode.name());
    }

    public enum TempStore implements PragmaValue {
        DEFAULT,
        FILE,
        MEMORY;

        public String getValue() {
            return name();
        }
    }

    /**
     * Changes the setting of the "hexkey" flag.
     *
     * @param mode One of {@link HexKeyMode}:
     *     <ul>
     *       <li>NONE - SQLite uses a string based password
     *       <li>SSE - the SQLite database engine will use pragma hexkey = '' to set the password
     *       <li>SQLCIPHER - the SQLite database engine calls pragma key = "x''" to set the password
     *     </ul>
     */
    public void setHexKeyMode(HexKeyMode mode) {
        setPragma(Pragma.HEXKEY_MODE, mode.name());
    }

    public enum HexKeyMode implements PragmaValue {
        NONE,
        SSE,
        SQLCIPHER;

        public String getValue() {
            return name();
        }
    }

    /**
     * Changes the setting of the "temp_store" parameter.
     *
     * @param storeType One of {@link TempStore}:
     *     <ul>
     *       <li>DEFAULT - the compile-time C preprocessor macro SQLITE_TEMP_STORE is used to
     *           determine where temporary tables and indices are stored
     *       <li>FILE - temporary tables and indices are stored in a file.
     *     </ul>
     *     <li>MEMORY - temporary tables and indices are kept in as if they were pure in-memory
     *         databases memory
     * @see <a
     *     href="https://www.sqlite.org/pragma.html#pragma_temp_store">www.sqlite.org/pragma.html#pragma_temp_store</a>
     */
    public void setTempStore(TempStore storeType) {
        setPragma(Pragma.TEMP_STORE, storeType.name());
    }

    /**
     * Changes the value of the sqlite3_temp_directory global variable, which many operating-system
     * interface backends use to determine where to store temporary tables and indices.
     *
     * @param directoryName Directory name for storing temporary tables and indices.
     * @see <a
     *     href="https://www.sqlite.org/pragma.html#pragma_temp_store_directory">www.sqlite.org/pragma.html#pragma_temp_store_directory</a>
     */
    public void setTempStoreDirectory(String directoryName) {
        setPragma(Pragma.TEMP_STORE_DIRECTORY, String.format("'%s'", directoryName));
    }

    /**
     * Set the value of the user-version. The user-version is not used internally by SQLite. It may
     * be used by applications for any purpose. The value is stored in the database header at offset
     * 60.
     *
     * @param version A big-endian 32-bit signed integer.
     * @see <a
     *     href="https://www.sqlite.org/pragma.html#pragma_user_version">www.sqlite.org/pragma.html#pragma_user_version</a>
     */
    public void setUserVersion(int version) {
        set(Pragma.USER_VERSION, version);
    }

    /**
     * Set the value of the application-id. The application-id is not used internally by SQLite.
     * Applications that use SQLite as their application file-format should set the Application ID
     * integer to a unique integer so that utilities such as file(1) can determine the specific file
     * type. The value is stored in the database header at offset 68.
     *
     * @param id A big-endian 32-bit unsigned integer.
     * @see <a
     *     href="https://www.sqlite.org/pragma.html#pragma_application_id">www.sqlite.org/pragma.html#pragma_application_id</a>
     */
    public void setApplicationId(int id) {
        set(Pragma.APPLICATION_ID, id);
    }

    public enum TransactionMode implements PragmaValue {
        DEFERRED,
        IMMEDIATE,
        EXCLUSIVE;

        public String getValue() {
            return name();
        }

        public static TransactionMode getMode(String mode) {
            return TransactionMode.valueOf(mode.toUpperCase());
        }
    }

    /**
     * Sets the mode that will be used to start transactions.
     *
     * @param transactionMode One of {@link TransactionMode}.
     * @see <a
     *     href="https://www.sqlite.org/lang_transaction.html">https://www.sqlite.org/lang_transaction.html</a>
     */
    public void setTransactionMode(TransactionMode transactionMode) {
        this.defaultConnectionConfig.setTransactionMode(transactionMode);
    }

    /**
     * Sets the mode that will be used to start transactions.
     *
     * @param transactionMode One of DEFERRED, IMMEDIATE or EXCLUSIVE.
     * @see <a
     *     href="https://www.sqlite.org/lang_transaction.html">https://www.sqlite.org/lang_transaction.html</a>
     */
    public void setTransactionMode(String transactionMode) {
        setTransactionMode(TransactionMode.getMode(transactionMode));
    }

    /** @return The transaction mode. */
    public TransactionMode getTransactionMode() {
        return this.defaultConnectionConfig.getTransactionMode();
    }

    public enum DatePrecision implements PragmaValue {
        SECONDS,
        MILLISECONDS;

        public String getValue() {
            return name();
        }

        public static DatePrecision getPrecision(String precision) {
            return DatePrecision.valueOf(precision.toUpperCase());
        }
    }

    /** @param datePrecision One of SECONDS or MILLISECONDS */
    public void setDatePrecision(String datePrecision) {
        this.defaultConnectionConfig.setDatePrecision(DatePrecision.getPrecision(datePrecision));
    }

    public enum DateClass implements PragmaValue {
        INTEGER,
        TEXT,
        REAL;

        public String getValue() {
            return name();
        }

        public static DateClass getDateClass(String dateClass) {
            return DateClass.valueOf(dateClass.toUpperCase());
        }
    }

    /** @param dateClass One of INTEGER, TEXT or REAL */
    public void setDateClass(String dateClass) {
        this.defaultConnectionConfig.setDateClass(DateClass.getDateClass(dateClass));
    }

    /** @param dateStringFormat Format of date string */
    public void setDateStringFormat(String dateStringFormat) {

        this.defaultConnectionConfig.setDateStringFormat(dateStringFormat);
    }

    /** @param milliseconds Connect to DB timeout in milliseconds */
    public void setBusyTimeout(int milliseconds) {
        setPragma(Pragma.BUSY_TIMEOUT, Integer.toString(milliseconds));
        busyTimeout = milliseconds;
    }

    public int getBusyTimeout() {
        return busyTimeout;
    }

    public boolean isGetGeneratedKeys() {
        return this.defaultConnectionConfig.isGetGeneratedKeys();
    }

    public void setGetGeneratedKeys(boolean generatedKeys) {
        this.defaultConnectionConfig.setGetGeneratedKeys(generatedKeys);
    }
}
